How can I outsmart this horse on taking his oral meds?

Give me another good way to give the crushed pills to the horse I board. This guy has figured out every way to sniff out his crushed pills in bran mash, oatmeal, his favorite grain. His owner and I have blended up the pills in apple bits, brown sugar mixed with a little water which WAS successful but this Smart Guy is on to us there, too. We have also put the blended concoction in a turkey roaster syringe but Smart Guy puts his tongue over the end of the syringe. This horse knows that the meds help him but, like all of us, who wants to get that nasty taste past his taste buds and the acute sense of smell. Yes, I put his crushed meds on top of his favorite grain. He walked away. He just didn't eat and he has to eat. I have had horses all my life and thought I'd seen it all when it came to vetting out. This is an easy fix and, yet? its not an easy fix! I don't want to to buy a pill "gun" that shoots the pill down his throat. The meds are for arthritis. The vet returns next week and I can ask her what she wants to do. She will suggest injections. In the meantime, any ideas on how to deliver the meds? Thank you.